Native to:
Afghanistan,
Alabama,
Alaska,
Albania,
Alberta,
Algeria,
Altay,
Amsterdam-St.Paul Is,
Amur,
Angola,
Argentina Northwest,
Arizona,
Arkansas,
Assam,
Austria,
Azores,
Baleares,
Baltic States,
Bangladesh,
Belarus,
Belgium,
Bismarck Archipelago,
Bolivia,
Borneo,
Brazil North,
Brazil South,
Brazil Southeast,
Brazil West-Central,
British Columbia,
Bulgaria,
Burundi,
Buryatiya,
California,
Cambodia,
Cameroon,
Canary Is.,
Cape Provinces,
Cape Verde,
Caroline Is.,
Central African Repu,
Central European Rus,
China North-Central,
China South-Central,
China Southeast,
Chita,
Colombia,
Colorado,
Comoros,
Connecticut,
Cook Is.,
Corse,
Costa Rica,
Cuba,
Cyprus,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
Dominican Republic,
East European Russia,
East Himalaya,
Easter Is.,
Ecuador,
El Salvador,
Equatorial Guinea,
Eritrea,
Ethiopia,
Fiji,
Finland,
Florida,
France,
Free State,
Føroyar,
Gabon,
Galápagos,
Georgia,
Germany,
Great Britain,
Greece,
Greenland,
Guatemala,
Guinea,
Guinea-Bissau,
Gulf of Guinea Is.,
Hainan,
Haiti,
Hawaii,
Honduras,
Hungary,
Iceland,
Idaho,
Illinois,
India,
Indiana,
Inner Mongolia,
Iowa,
Iran,
Ireland,
Irkutsk,
Italy,
Ivory Coast,
Jamaica,
Japan,
Jawa,
Kamchatka,
Kansas,
Kazakhstan,
Kentucky,
Kenya,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Kriti,
Krym,
Kuril Is.,
KwaZulu-Natal,
Labrador,
Laos,
Lebanon-Syria,
Lesotho,
Lesser Sunda Is.,
Liberia,
Louisiana,
Madagascar,
Madeira,
Magadan,
Maine,
Malawi,
Malaya,
Maluku,
Manchuria,
Manitoba,
Marquesas,
Maryland,
Massachusetts,
Mauritius,
Mexico Central,
Mexico Gulf,
Mexico Northeast,
Mexico Northwest,
Mexico Southeast,
Mexico Southwest,
Michigan,
Minnesota,
Mississippi,
Missouri,
Mongolia,
Montana,
Morocco,
Mozambique,
Myanmar,
Nansei-shoto,
Nebraska,
Nepal,
Netherlands,
Nevada,
New Brunswick,
New Guinea,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
Nicaragua,
Nigeria,
North Carolina,
North Caucasus,
North Dakota,
North European Russi,
Northern Provinces,
Northwest European R,
Northwest Territorie,
Norway,
Nova Scotia,
Nunavut,
Ogasawara-shoto,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pakistan,
Palestine,
Panamá,
Pennsylvania,
Peru,
Philippines,
Poland,
Portugal,
Primorye,
Prince Edward I.,
Qinghai,
Queensland,
Québec,
Rhode I.,
Romania,
Rwanda,
Réunion,
Sakhalin,
Samoa,
Sardegna,
Saskatchewan,
Seychelles,
Sicilia,
Sierra Leone,
Society Is.,
Solomon Is.,
Somalia,
South Carolina,
South Dakota,
Spain,
Sri Lanka,
St.Helena,
Sudan,
Sulawesi,
Sumatera,
Swaziland,
Sweden,
Switzerland,
Tadzhikistan,
Taiwan,
Tanzania,
Tennessee,
Texas,
Thailand,
Tibet,
Transcaucasus,
Tristan da Cunha,
Tunisia,
Turkey,
Turkey-in-Europe,
Tuva,
Uganda,
Ukraine,
Utah,
Uzbekistan,
Vanuatu,
Venezuela,
Vermont,
Vietnam,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yemen,
Yugoslavia,
Yukon,
Zambia,
Zaïre,
Zimbabwe
Extinct in:
Ascension
Introduced into:
Argentina South,
Chatham Is.,
Falkland Is.,
New Zealand North